From patchwork Fri Jun 12 00:04:58 2020 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Andrey Shinkevich X-Patchwork-Id: 11601061 Return-Path: Received: from mail.kernel.org (pdx-korg-mail-1.web.codeaurora.org [172.30.200.123]) by pdx-korg-patchwork-2.web.codeaurora.org (Postfix) with ESMTP id BDCFE1391 for ; Fri, 12 Jun 2020 00:09:39 +0000 (UTC) Received: from lists.gnu.org (lists.gnu.org [209.51.188.17]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by mail.kernel.org (Postfix) with ESMTPS id 9EB6A20835 for ; Fri, 12 Jun 2020 00:09:39 +0000 (UTC) DMARC-Filter: OpenDMARC Filter v1.3.2 mail.kernel.org 9EB6A20835 Authentication-Results: mail.kernel.org; dmarc=fail (p=none dis=none) header.from=virtuozzo.com Authentication-Results: mail.kernel.org; spf=pass smtp.mailfrom=qemu-devel-bounces+patchwork-qemu-devel=patchwork.kernel.org@nongnu.org Received: from localhost ([::1]:52106 helo=lists1p.gnu.org) by lists.gnu.org with esmtp (Exim 4.90_1) (envelope-from ) id 1jjXGM-0000u1-Uo for patchwork-qemu-devel@patchwork.kernel.org; Thu, 11 Jun 2020 20:09:38 -0400 Received: from eggs.gnu.org ([2001:470:142:3::10]:56648) by lists.gnu.org with esmtps (TLS1.2:ECDHE_RSA_AES_256_GCM_SHA384:256) (Exim 4.90_1) (envelope-from ) id 1jjXC3-0008NP-Pg; Thu, 11 Jun 2020 20:05:11 -0400 Received: from relay.sw.ru ([185.231.240.75]:52838 helo=relay3.sw.ru) by eggs.gnu.org with esmtps (TLS1.3:ECDHE_RSA_AES_256_GCM_SHA384:256) (Exim 4.90_1) (envelope-from ) id 1jjXBy-0006IB-Oy; Thu, 11 Jun 2020 20:05:11 -0400 Received: from [172.16.25.136] (helo=localhost.sw.ru) by relay3.sw.ru with esmtp (Exim 4.93) (envelope-from ) id 1jjXBr-0002Yd-Lz; Fri, 12 Jun 2020 03:04:59 +0300 From: Andrey Shinkevich To: qemu-block@nongnu.org Subject: [PATCH v7 5/9] qcow2_format.py: pass cluster size to substructures Date: Fri, 12 Jun 2020 03:04:58 +0300 Message-Id: <1591920302-1002219-6-git-send-email-andrey.shinkevich@virtuozzo.com> X-Mailer: git-send-email 1.8.3.1 In-Reply-To: <1591920302-1002219-1-git-send-email-andrey.shinkevich@virtuozzo.com> References: <1591920302-1002219-1-git-send-email-andrey.shinkevich@virtuozzo.com> Received-SPF: pass client-ip=185.231.240.75; envelope-from=andrey.shinkevich@virtuozzo.com; helo=relay3.sw.ru X-detected-operating-system: by eggs.gnu.org: First seen = 2020/06/11 20:05:03 X-ACL-Warn: Detected OS = Linux 3.11 and newer X-Spam_score_int: -18 X-Spam_score: -1.9 X-Spam_bar: - X-Spam_report: (-1.9 / 5.0 requ) BAYES_00=-1.9, SPF_HELO_NONE=0.001, SPF_PASS=-0.001 autolearn=_AUTOLEARN X-Spam_action: no action X-BeenThere: qemu-devel@nongnu.org X-Mailman-Version: 2.1.23 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Cc: kwolf@redhat.com, vsementsov@virtuozzo.com, qemu-devel@nongnu.org, mreitz@redhat.com, andrey.shinkevich@virtuozzo.com, den@openvz.org Errors-To: qemu-devel-bounces+patchwork-qemu-devel=patchwork.kernel.org@nongnu.org Sender: "Qemu-devel" The cluster size of an image is the QcowHeader class member and may be obtained by dependent extension structures such as Qcow2BitmapExt for further bitmap table details print. Signed-off-by: Andrey Shinkevich --- tests/qemu-iotests/qcow2_format.py | 19 ++++++++++++++----- 1 file changed, 14 insertions(+), 5 deletions(-) diff --git a/tests/qemu-iotests/qcow2_format.py b/tests/qemu-iotests/qcow2_format.py index 90eff92..eb99119 100644 --- a/tests/qemu-iotests/qcow2_format.py +++ b/tests/qemu-iotests/qcow2_format.py @@ -116,6 +116,10 @@ class Qcow2BitmapExt(Qcow2Struct): ('u64', '{:#x}', 'bitmap_directory_offset') ) + def __init__(self, data, cluster_size): + super().__init__(data=data) + self.cluster_size = cluster_size + def read_bitmap_directory(self, fd): self.bitmaps = [] fd.seek(self.bitmap_directory_offset) @@ -123,7 +127,8 @@ class Qcow2BitmapExt(Qcow2Struct): for n in range(self.nb_bitmaps): buf = fd.read(buf_size) - dir_entry = Qcow2BitmapDirEntry(data=buf) + dir_entry = Qcow2BitmapDirEntry(data=buf, + cluster_size=self.cluster_size) fd.seek(dir_entry.extra_data_size, FROM_CURRENT) bitmap_name = fd.read(dir_entry.name_size) dir_entry.name = bitmap_name.decode('ascii') @@ -159,8 +164,9 @@ class Qcow2BitmapDirEntry(Qcow2Struct): ('u32', '{}', 'extra_data_size') ) - def __init__(self, data): + def __init__(self, data, cluster_size): super().__init__(data=data) + self.cluster_size = cluster_size self.bitmap_table_bytes = self.bitmap_table_size \ * struct.calcsize('Q') @@ -205,11 +211,13 @@ class QcowHeaderExtension(Qcow2Struct): # then padding to next multiply of 8 ) - def __init__(self, magic=None, length=None, data=None, fd=None): + def __init__(self, magic=None, length=None, data=None, fd=None, + cluster_size=None): """ Support both loading from fd and creation from user data. For fd-based creation current position in a file will be used to read the data. + The cluster_size value may be obtained by dependent structures. This should be somehow refactored and functionality should be moved to superclass (to allow creation of any qcow2 struct), but then, fields @@ -243,7 +251,8 @@ class QcowHeaderExtension(Qcow2Struct): self.data_str = data_str if self.magic == QCOW2_EXT_MAGIC_BITMAPS: - self.obj = Qcow2BitmapExt(data=self.data) + self.obj = Qcow2BitmapExt(data=self.data, + cluster_size=cluster_size) else: self.obj = None @@ -318,7 +327,7 @@ class QcowHeader(Qcow2Struct): end = self.cluster_size while fd.tell() < end: - ext = QcowHeaderExtension(fd=fd) + ext = QcowHeaderExtension(fd=fd, cluster_size=self.cluster_size) if ext.magic == 0: break else: